Test: Electromagnetic Waves - 1
10 Questions MCQ Test Topicwise Question Bank for Electrical Engineering | Test: Electromagnetic Waves - 1
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Consider the following statements associated with an electromagnetic wave in free space:
- At every point in space, the electric field
and th emagnetic vector field 
are perpendicular to each other and to the direction of propagation.
- Velocity of propagation of wave in free space is equal to
oscillate in phase opposition and the ratio of their amplitude is constant being equal to 
- Whatever may be the frequency , the electromagnetic wave travels in space with velocity of light.
Which of the above statements are correct?
and th emagnetic vector field are perpendicular to each other and to the direction of propagation. oscillate in phase opposition and the ratio of their amplitude is constant being equal to - Velocity of propagation of EM-wave in free space is equal
= speed of light (3 x 108 m/s). Hence statement-2 is not correct. 
oscillate in phase and the ratio of their amplitude is constant being equal to 
. Hence, statement-3 is not correct.
Thus, statements-1 and 4 are only correct.
Intrinsic impedance or charcteristic impedance of the non-conducting medium in the free space is
Intrinsic impedance or characteristic impedance of the non-conducting medium in free space is given as
If the magnitude of 
in a plane wave is 1 V/m, what is the magnitude of H for a plane wave in free space?
in a plane wave is 1 V/m, what is the magnitude of H for a plane wave in free space?We know that,
What is the velocity of a plane wave in a lossless medium having a relative permittivity of 5 and relative permeability of unity?
Velocity of propagation is given by
A plane wave in free space has an average Poynting vector of 1 Wm-2. The average energy density is
Poynting vector P= EH and total energy density W= μH2.
Infree space 
are respectively given by 
and 
The value of β and H0 are respectively
This is a plane wave.
For plane wave in space,
In a homogeneous non-conducting region where 
The value of ∈r and ω are
Looking at the phase 
we can find that direction of propagation is +z.
Since 
must also lie in a + z direction, A must have the direction 
Assertion (A): Uniform plane electromagnetic waves are transverse in nature.
Reason (R): Uniform plane electromagnetic
waves have components of 
only in direction perpendicular to the direction of propagation and not in the direction of propagation.
Assertion (A): The term 
is sometimes referred to the loss tangent.
Reason (R): The two vectors Jc (conduction current density) and Jd (displacement current density) are 180° out of phase and are in the opposite direction in space.
which indicates that the two vectors Jc and Jd are out of phase in time and are in the same direction in the space. Hence, reason is not a correct statement.
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